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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract] |  |
Net income | $ 144,975 | $ 1,419
Postretirement benefits: |  |
Actuarial gain (loss) | 7 | (12)
Amortization of prior service costs | 92 | 92
Income tax expense | (26) | (20)
Total comprehensive income | $ 145,048 | $ 1,479

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